src/FileAttributeFinder.h
author František Kučera <franta-hg@frantovo.cz>
Wed, 16 Jan 2019 17:23:05 +0100
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/**
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 * Relational pipes
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 * Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info)
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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 */
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#pragma once
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#include <vector>
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#include <filesystem>
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#include <relpipe/writer/typedefs.h>
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#include <relpipe/writer/AttributeMetadata.h>
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#include <relpipe/writer/RelationalWriter.h>
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#include "RequestedField.h"
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namespace relpipe {
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namespace in {
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namespace filesystem {
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namespace fs = std::filesystem;
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using namespace relpipe::writer;
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class FileAttributeFinder : public AttributeFinder {
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private:
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	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings.
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	fs::path currentFile;
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	string_t currentOwner;
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	string_t currentGroup;
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	string_t getType(const fs::path& file) {
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		// TODO: Use whole words? (letters are compatible with find -type)
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		if (fs::is_regular_file(file)) return L"f";
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		else if (fs::is_symlink(file)) return L"l"; // symlinks to directories are both symlinks and directories
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		else if (fs::is_directory(file)) return L"d";
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		else if (fs::is_fifo(file)) return L"p";
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		else if (fs::is_socket(file)) return L"s";
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		else if (fs::is_block_file(file)) return L"b";
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		else if (fs::is_character_file(file)) return L"c";
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		else return L"o";
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	}
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	void fetchOwner(const fs::path& file, string_t& owner, string_t& group) {
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		// TODO: throw exception on error
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		// TODO: get user and group in C++ way?
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		struct stat info;
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		stat(file.c_str(), &info);
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		/**
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		 * The return value may point to a static area, and may  be
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		 * overwritten  by  subsequent calls to getpwent(3), getpw‐
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		 * nam(), or getpwuid().  (Do not pass the returned pointer
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		 * to free(3).)
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		 */
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		struct passwd* pw = getpwuid(info.st_uid);
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		struct group* gr = getgrgid(info.st_gid);
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		owner = convertor.from_bytes(pw->pw_name);
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		group = convertor.from_bytes(gr->gr_name);
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	}
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public:
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	static const string_t FIELD_PATH_ORIGINAL;
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	static const string_t FIELD_NAME;
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	static const string_t FIELD_SIZE;
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	static const string_t FIELD_PATH_ABSOLUTE;
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	static const string_t FIELD_PATH_CANONICAL;
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	static const string_t FIELD_TYPE;
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	static const string_t FIELD_OWNER;
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	static const string_t FIELD_GROUP;
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	virtual vector<AttributeMetadata> toMetadata(const RequestedField& field) override {
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		if (field.group == RequestedField::GROUP_FILE) {
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			if (field.name == FIELD_SIZE) return { AttributeMetadata{field.name, TypeId::INTEGER}};
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			else return { AttributeMetadata{field.name, TypeId::STRING}};
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		} else {
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			return {};
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		}
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	}
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	void startFile(const fs::path& file) override {
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		currentFile = file;
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	};
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	void endFile() override {
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		currentOwner.clear();
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		currentGroup.clear();
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	};
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	virtual void writeField(RelationalWriter* writer, const RequestedField& field) override {
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		if (field.group == RequestedField::GROUP_FILE) {
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			if (field.name == FIELD_NAME) {
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				writer->writeAttribute(currentFile.filename().wstring());
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			} else if (field.name == FIELD_PATH_ORIGINAL) {
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				writer->writeAttribute(currentFile.wstring());
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			} else if (field.name == FIELD_PATH_ABSOLUTE) {
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				writer->writeAttribute(fs::absolute(currentFile).wstring());
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			} else if (field.name == FIELD_PATH_CANONICAL) {
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				writer->writeAttribute(fs::canonical(currentFile).wstring());
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			} else if (field.name == FIELD_TYPE) {
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				writer->writeAttribute(getType(currentFile));
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			} else if (field.name == FIELD_SIZE) {
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				integer_t size = fs::is_regular_file(currentFile) ? fs::file_size(currentFile) : 0;
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				writer->writeAttribute(&size, typeid (size));
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			} else if (field.name == FIELD_OWNER) {
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				if (currentOwner.empty()) fetchOwner(currentFile, currentOwner, currentGroup);
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				writer->writeAttribute(currentOwner);
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			} else if (field.name == FIELD_GROUP) {
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				if (currentOwner.empty()) fetchOwner(currentFile, currentOwner, currentGroup);
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				writer->writeAttribute(currentGroup);
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			} else {
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				// TODO: should not happend; check supported attributes in toMetadata()?
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				writer->writeAttribute(L"");
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			}
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		}
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	}
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	virtual ~FileAttributeFinder() override {
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	}
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};
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const string_t FileAttributeFinder::FIELD_PATH_ORIGINAL = L"path";
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const string_t FileAttributeFinder::FIELD_NAME = L"name";
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const string_t FileAttributeFinder::FIELD_SIZE = L"size";
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const string_t FileAttributeFinder::FIELD_PATH_ABSOLUTE = L"path_absolute";
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const string_t FileAttributeFinder::FIELD_PATH_CANONICAL = L"path_canonical";
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const string_t FileAttributeFinder::FIELD_TYPE = L"type";
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const string_t FileAttributeFinder::FIELD_OWNER = L"owner";
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const string_t FileAttributeFinder::FIELD_GROUP = L"group";
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}
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}
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}